111100145004521 has 4 divisors (see below), whose sum is σ = 111501228560772. Its totient is φ = 110699061448272.

The previous prime is 111100145004503. The next prime is 111100145004571. The reversal of 111100145004521 is 125400541001111.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13930548493225 + 97169596511296 = 3732365^2 + 9857464^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111100145004521 is a prime.

It is a super-2 number, since 2×111100145004521² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111100145004571) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 200541777710 + ... + 200541778263.

It is an arithmetic number, because the mean of its divisors is an integer number (27875307140193).

Almost surely, 2^{111100145004521} is an apocalyptic number.

It is an amenable number.

111100145004521 is a deficient number, since it is larger than the sum of its proper divisors (401083556251).

111100145004521 is an equidigital number, since it uses as much as digits as its factorization.

111100145004521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401083556250.

The product of its (nonzero) digits is 800, while the sum is 26.

Adding to 111100145004521 its reverse (125400541001111), we get a palindrome (236500686005632).

The spelling of 111100145004521 in words is "one hundred eleven trillion, one hundred billion, one hundred forty-five million, four thousand, five hundred twenty-one".